Re: [Ifeffit] Cementite EXAFS - thanks

Hi Matt, I imagined you might not remember about the data or how was it prepared, so I decided not to bother you asking about it. But sounds like you do have an amazing memory. Yes, I would be happy to characterize the sample by running both EXAFS and XRD on it if you still have it. I would of course share the information with the mailing list, once I characterize it. I will collect the sample from you sometime soon. Thanks again for offering. Regards, Bhoopesh On Thu, Sep 24, 2009 at 4:35 PM, Matt Newville wrote:

Hi Bhoopesh,

It's amazing to me how many people have asked about this data set.

I did not prepare the sample of Fe3C measured for the data in the model compound library. Basically, a user interested in reduced iron phases and with good knowledge of carbides showed up at the beamline with a vial of black powder marked Fe3C. We made a powder-on-tape sample of this and measured it. At the time, the user (who knows about diamond synthesis and who I trust) said the sample was made by another colleague. Yes, it all sounds "secret formula", and I do not know whether it is pure cementite. If you're interested, believe I still have this sample in my Standards Notebook if you'd like to measure XAFS or XRD on it.

--Matt

On Thu, Sep 24, 2009 at 4:08 PM, Bhoopesh Mishra wrote:

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Hi Scott and Mathew, Thanks for pointing me to Matt Newville's archive. It is a great resource to have and I have used it on several occasions.

However, what I found on that database is "Fe3C". Since there are couple of different local environments for Fe3C, and not all of them are Cementite - I am not sure if that would be a good standard for me. Nevertheless, it served as a good starting point.

It would be great if Andrew can send us his data.

Thanks again, Bhoopesh

On Thu, Sep 24, 2009 at 11:54 AM, Scott Calvin wrote:

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Hi Bhoopesh,

There are files that are identified as cementite in Matt Newville's archive:

http://cars9.uchicago.edu/~newville/ModelLib/search.htmlhttp://cars9.uchicago.edu/%7Enewville/ModelLib/search.html

If you manage to get any other data, let me know; I've used the standard at the link above, but I'd like to confirm it.

--Scott Calvin Sarah Lawrence College

On Sep 24, 2009, at 11:45 AM, bhoopeshm wrote:

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Dear All, I am writing to see if anyone on this mailing list has ever measured "Cementite" (Fe3C) EXAFS. It is basically an Iron Carbide, nothing exotic at all.

I would be very grateful to anyone who might want to share an EXAFS spectrum of Cementite (Fe3C).

Regards, Bhoopesh

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